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(LOSS) EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Net (loss) income $ (61,373) $ (90,433) $ 10,617
Weighted-average common shares outstanding (shares) 80,336 79,055 78,564
(Loss) earnings per share, basic (dollars per share) $ (0.76) $ (1.14) $ 0.14
Effective of dilutive securities (shares) 0 0 4,500
Weighted - average common shares outstanding, assuming dilution (shares) 80,336 79,055 83,064
(Loss) earnings per share, diluted (dollars per share) $ (0.76) $ (1.14) $ 0.13
Outstanding anti-dilutive stock options and RSUs (shares) 6,278 5,911 188
Stock options      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Weighted-average effect of dilutive securities (shares) 0 0 2,891
RSUs      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Weighted-average effect of dilutive securities (shares) 0 0 1,609